Updated comedi_dio_config implementation to reflect logical split between COMEDI_INPUT/COMEDI_OUTPUT and corresponding config insn ids (even though they still have the same value).  Made comedi_dio_config return 0 on success for better consistency in API.
Updated comedi_dio_config implementation to reflect logical split
between COMEDI_INPUT/COMEDI_OUTPUT and corresponding config insn ids
(even though they still have the same value).  Made comedi_dio_config
return 0 on success for better consistency in API.

olsonse/comedilib,Linux-Comedi/comedilib,olsonse/comedilib,olsonse/comedilib,Linux-Comedi/comedilib,olsonse/comedilib,olsonse/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,Linux-Comedi/comedilib,olsonse/comedilib,Linux-Comedi/comedilib